condition mean min max ZT0-3 12.11496 12.11496 12.11496 ZT4-7 11.6443145 11.6443145 11.6443145 ZT8-11 11.3798825 11.3798825 11.3798825 ZT12-15 12.189084000000001 12.189084000000001 12.189084000000001 ZT16-19 11.1064255 11.1064255 11.1064255 ZT20-23 11.435812 11.435812 11.435812